diff --git a/WebHandler/ADCompareWebHandler.cs b/WebHandler/ADCompareWebHandler.cs
index efedd1c..090f3f5 100644
--- a/WebHandler/ADCompareWebHandler.cs
+++ b/WebHandler/ADCompareWebHandler.cs
@@ -1,8 +1,8 @@
 using Disco.Plugins.ADCompare.Features;
-using Disco.Plugins.ADCompare.Models;
 using Disco.Services.Plugins;
 using Newtonsoft.Json;
 using System;
+using System.Linq;
 using System.Text;
 using System.Web.Mvc;
 
@@ -20,8 +20,6 @@ namespace Disco.Plugins.ADCompare.WebHandler
                     return Index();
                 case "compare":
                     return Compare();
-                case "compareuser":
-                    return CompareUser();
                 case "export":
                     return ExportCsv();
                 default:
@@ -29,28 +27,20 @@ namespace Disco.Plugins.ADCompare.WebHandler
             }
         }
 
-        /// <summary>
-        /// Landing page with a button to run comparison
-        /// </summary>
         private ActionResult Index()
         {
-            var html = BuildIndexPage();
             return new ContentResult
             {
-                Content = html,
+                Content = BuildDashboardHtml(),
                 ContentType = "text/html",
                 ContentEncoding = Encoding.UTF8
             };
         }
 
-        /// <summary>
-        /// Run full comparison and return results as JSON
-        /// </summary>
         private ActionResult Compare()
         {
-            var service = new ADCompareService(Database);
-            var summary = service.CompareAllUsers();
-
+            var service = new DeviceCompareService(Database);
+            var summary = service.CompareAllDevices();
             return new ContentResult
             {
                 Content = JsonConvert.SerializeObject(summary, Formatting.Indented),
@@ -59,237 +49,88 @@ namespace Disco.Plugins.ADCompare.WebHandler
             };
         }
 
-        /// <summary>
-        /// Compare a single user - expects ?userId=DOMAIN\username
-        /// </summary>
-        private ActionResult CompareUser()
-        {
-            var userId = HostController.Request.QueryString["userId"];
-            if (string.IsNullOrWhiteSpace(userId))
-            {
-                return new HttpStatusCodeResult(400, "userId parameter required");
-            }
-
-            var user = Database.Users.Find(userId);
-            if (user == null)
-            {
-                return new HttpStatusCodeResult(404, "User not found in Disco");
-            }
-
-            var service = new ADCompareService(Database);
-            var result = service.CompareUser(user);
-
-            return new ContentResult
-            {
-                Content = JsonConvert.SerializeObject(result, Formatting.Indented),
-                ContentType = "application/json",
-                ContentEncoding = Encoding.UTF8
-            };
-        }
-
-        /// <summary>
-        /// Export comparison results as CSV
-        /// </summary>
         private ActionResult ExportCsv()
         {
-            var service = new ADCompareService(Database);
-            var summary = service.CompareAllUsers();
-
+            var service = new DeviceCompareService(Database);
+            var summary = service.CompareAllDevices();
             var sb = new StringBuilder();
-            sb.AppendLine("UserId,DisplayName,FoundInAD,ADDisabled,MismatchedFields,Details");
-
-            foreach (var result in summary.Results)
+            sb.AppendLine("SerialNumber,ComputerName,DiscoAssignedUser,DiscoAssignedUserName,ADManagedByUser,ADManagedByName,Match,Reason");
+            foreach (var r in summary.Results.Where(r => !r.IsMatch))
             {
-                var mismatchFields = result.HasMismatches
-                    ? string.Join("; ", result.Mismatches.ConvertAll(m => m.FieldName))
-                    : "None";
-
-                var details = result.HasMismatches
-                    ? string.Join("; ", result.Mismatches.ConvertAll(m =>
-                        $"{m.FieldName}: Disco='{m.DiscoValue}' AD='{m.ADValue}'"))
-                    : "";
-
-                sb.AppendLine($"\"{CsvEscape(result.UserId)}\",\"{CsvEscape(result.DisplayName)}\",{result.UserFoundInAD},{result.ADAccountDisabled},\"{CsvEscape(mismatchFields)}\",\"{CsvEscape(details)}\"");
+                sb.AppendLine(string.Join(",",
+                    Csv(r.SerialNumber), Csv(r.ComputerName),
+                    Csv(r.DiscoAssignedUserId), Csv(r.DiscoAssignedUserDisplayName),
+                    Csv(r.ADManagedByUserId), Csv(r.ADManagedByDisplayName),
+                    r.IsMatch.ToString(), Csv(r.MismatchReason)));
             }
-
-            var fileName = $"AD_Compare_{DateTime.Now:yyyyMMdd_HHmmss}.csv";
-
-            HostController.Response.Headers.Add("Content-Disposition", $"attachment; filename=\"{fileName}\"");
-
-            return new ContentResult
-            {
-                Content = sb.ToString(),
-                ContentType = "text/csv",
-                ContentEncoding = Encoding.UTF8
-            };
+            HostController.Response.Headers.Add("Content-Disposition",
+                $"attachment; filename=\"AD_ManagedBy_Compare_{DateTime.Now:yyyyMMdd_HHmmss}.csv\"");
+            return new ContentResult { Content = sb.ToString(), ContentType = "text/csv", ContentEncoding = Encoding.UTF8 };
         }
 
-        private string CsvEscape(string value)
-        {
-            if (string.IsNullOrEmpty(value)) return "";
-            return value.Replace("\"", "\"\"");
-        }
+        private string Csv(string v) => $"\"{(v ?? "").Replace("\"", "\"\"")}\"";
 
-        #region HTML Page Builder
-
-        private string BuildIndexPage()
+        private string BuildDashboardHtml()
         {
             var pluginUrl = Url.Action(MVC.API.Disco.Plugin.PluginWebAction(Manifest.Id, null));
-
             return $@"
-<div id='adcompare-container'>
-    <h2>AD Compare - User Detail Comparison</h2>
-    <p>Compare Active Directory user details against Disco ICT records to identify mismatches.</p>
-
-    <div style='margin: 15px 0;'>
-        <button id='btnRunCompare' class='btn btn-primary' onclick='runComparison()'>
-            <i class='fa fa-refresh'></i> Run Full Comparison
-        </button>
-        <button id='btnExport' class='btn btn-default' onclick='exportCsv()' style='margin-left: 10px;' disabled>
-            <i class='fa fa-download'></i> Export CSV
-        </button>
-        <span id='loading' style='display:none; margin-left: 15px;'>
-            <i class='fa fa-spinner fa-spin'></i> Comparing users against AD... This may take a moment.
-        </span>
+<div id='adcompare'>
+    <h2><i class='fa fa-exchange'></i> AD Compare &mdash; Device Managed By</h2>
+    <p>Compares the AD computer <strong>Managed By</strong> field against the Disco <strong>Assigned User</strong>.</p>
+    <div style='margin:15px 0;'>
+        <button id='btnRun' class='btn btn-primary' onclick='runCompare()'><i class='fa fa-refresh'></i> Run Comparison</button>
+        <button id='btnExport' class='btn btn-default' onclick='location.href=""{pluginUrl}/Export""' style='margin-left:10px;' disabled><i class='fa fa-download'></i> Export Mismatches CSV</button>
+        <span id='loading' style='display:none;margin-left:15px;'><i class='fa fa-spinner fa-spin'></i> Querying AD for all devices&hellip;</span>
     </div>
-
-    <div id='summary' style='display:none; margin: 15px 0; padding: 15px; background: #f5f5f5; border-radius: 4px;'>
-        <h4>Summary</h4>
+    <div id='summary' style='display:none;margin:15px 0;padding:15px;background:#f5f5f5;border-radius:4px;'>
         <div class='row'>
-            <div class='col-md-2'><strong>Total Users:</strong> <span id='statTotal'>-</span></div>
-            <div class='col-md-2'><strong>In Sync:</strong> <span id='statSync' class='text-success'>-</span></div>
-            <div class='col-md-2'><strong>Mismatches:</strong> <span id='statMismatch' class='text-warning'>-</span></div>
-            <div class='col-md-2'><strong>Not in AD:</strong> <span id='statNotFound' class='text-danger'>-</span></div>
-            <div class='col-md-2'><strong>AD Disabled:</strong> <span id='statDisabled' class='text-muted'>-</span></div>
+            <div class='col-md-2'><strong>Total Devices</strong><br/><span id='sTotal' style='font-size:24px;'>-</span></div>
+            <div class='col-md-2 text-success'><strong>Matched</strong><br/><span id='sMatch' style='font-size:24px;'>-</span></div>
+            <div class='col-md-2 text-warning'><strong>Mismatched</strong><br/><span id='sMismatch' style='font-size:24px;'>-</span></div>
+            <div class='col-md-2 text-danger'><strong>Not in AD</strong><br/><span id='sNotAD' style='font-size:24px;'>-</span></div>
+            <div class='col-md-2 text-info'><strong>No ManagedBy</strong><br/><span id='sNoMgr' style='font-size:24px;'>-</span></div>
+            <div class='col-md-2 text-muted'><strong>No Assignment</strong><br/><span id='sNoAssign' style='font-size:24px;'>-</span></div>
         </div>
     </div>
-
-    <div style='margin: 10px 0;'>
-        <label><input type='checkbox' id='chkIssuesOnly' checked onchange='filterResults()'> Show issues only</label>
-        <input type='text' id='txtSearch' placeholder='Search by username or display name...'
-               style='margin-left: 15px; padding: 4px 8px; width: 300px;' oninput='filterResults()'>
+    <div style='margin:10px 0;'>
+        <label><input type='checkbox' id='chkMismatchOnly' checked onchange='renderTable()'> Show mismatches only</label>
+        <input type='text' id='txtFilter' placeholder='Filter by serial, computer name, or user...' style='margin-left:15px;padding:4px 8px;width:350px;' oninput='renderTable()'>
     </div>
-
-    <table id='resultsTable' class='table table-striped table-condensed' style='display:none;'>
-        <thead>
-            <tr>
-                <th>Status</th>
-                <th>User ID</th>
-                <th>Display Name</th>
-                <th>Mismatched Fields</th>
-                <th>Details</th>
-            </tr>
-        </thead>
-        <tbody id='resultsBody'></tbody>
+    <table id='tbl' class='table table-striped table-condensed' style='display:none;'>
+        <thead><tr>
+            <th></th><th>Serial Number</th><th>Computer Name</th>
+            <th>Disco Assigned User</th><th>AD Managed By</th><th>Reason</th>
+        </tr></thead>
+        <tbody id='tbody'></tbody>
     </table>
 </div>
-
 <script>
-    var allResults = [];
-    var pluginBaseUrl = '{pluginUrl}';
-
-    function runComparison() {{
-        document.getElementById('loading').style.display = 'inline';
-        document.getElementById('btnRunCompare').disabled = true;
-        document.getElementById('resultsTable').style.display = 'none';
-
-        $.ajax({{
-            url: pluginBaseUrl + '/Compare',
-            method: 'GET',
-            dataType: 'json',
-            success: function(data) {{
-                allResults = data.Results;
-
-                document.getElementById('statTotal').textContent = data.TotalDiscoUsers;
-                document.getElementById('statSync').textContent = data.UsersInSync;
-                document.getElementById('statMismatch').textContent = data.UsersWithMismatches;
-                document.getElementById('statNotFound').textContent = data.UsersNotFoundInAD;
-                document.getElementById('statDisabled').textContent = data.ADAccountsDisabled;
-
-                document.getElementById('summary').style.display = 'block';
-                document.getElementById('btnExport').disabled = false;
-
-                filterResults();
-                document.getElementById('resultsTable').style.display = 'table';
-            }},
-            error: function(xhr) {{
-                alert('Error running comparison: ' + xhr.statusText);
-            }},
-            complete: function() {{
-                document.getElementById('loading').style.display = 'none';
-                document.getElementById('btnRunCompare').disabled = false;
-            }}
-        }});
-    }}
-
-    function filterResults() {{
-        var issuesOnly = document.getElementById('chkIssuesOnly').checked;
-        var searchTerm = document.getElementById('txtSearch').value.toLowerCase();
-        var tbody = document.getElementById('resultsBody');
-        tbody.innerHTML = '';
-
-        var filtered = allResults.filter(function(r) {{
-            if (issuesOnly && r.UserFoundInAD && !r.HasMismatches && !r.ADAccountDisabled) return false;
-            if (searchTerm) {{
-                var match = (r.UserId || '').toLowerCase().indexOf(searchTerm) >= 0 ||
-                            (r.DisplayName || '').toLowerCase().indexOf(searchTerm) >= 0;
-                if (!match) return false;
-            }}
-            return true;
-        }});
-
-        filtered.forEach(function(r) {{
-            var statusIcon, statusClass;
-            if (!r.UserFoundInAD) {{
-                statusIcon = '<i class=""fa fa-times-circle text-danger""></i>';
-                statusClass = 'danger';
-            }} else if (r.ADAccountDisabled) {{
-                statusIcon = '<i class=""fa fa-ban text-muted""></i>';
-                statusClass = 'warning';
-            }} else if (r.HasMismatches) {{
-                statusIcon = '<i class=""fa fa-exclamation-triangle text-warning""></i>';
-                statusClass = 'warning';
-            }} else {{
-                statusIcon = '<i class=""fa fa-check-circle text-success""></i>';
-                statusClass = '';
-            }}
-
-            var fields = r.HasMismatches
-                ? r.Mismatches.map(function(m) {{ return m.FieldName; }}).join(', ')
-                : (!r.UserFoundInAD ? 'Not found in AD' : (r.ADAccountDisabled ? 'AD Account Disabled' : 'All matched'));
-
-            var details = r.HasMismatches
-                ? '<table class=""table table-condensed"" style=""margin:0; font-size:12px;"">' +
-                  r.Mismatches.map(function(m) {{
-                      return '<tr><td><strong>' + m.FieldName + '</strong></td>' +
-                             '<td>Disco: <code>' + escapeHtml(m.DiscoValue) + '</code></td>' +
-                             '<td>AD: <code>' + escapeHtml(m.ADValue) + '</code></td></tr>';
-                  }}).join('') + '</table>'
-                : '';
-
-            var row = '<tr class=""' + statusClass + '"">' +
-                      '<td>' + statusIcon + '</td>' +
-                      '<td>' + escapeHtml(r.UserId) + '</td>' +
-                      '<td>' + escapeHtml(r.DisplayName || '') + '</td>' +
-                      '<td>' + fields + '</td>' +
-                      '<td>' + details + '</td></tr>';
-            tbody.innerHTML += row;
-        }});
-    }}
-
-    function exportCsv() {{
-        window.location.href = pluginBaseUrl + '/Export';
-    }}
-
-    function escapeHtml(text) {{
-        if (!text) return '';
-        var div = document.createElement('div');
-        div.appendChild(document.createTextNode(text));
-        return div.innerHTML;
-    }}
+var data=[];
+function runCompare(){{
+    $('#loading').show();$('#btnRun').prop('disabled',true);$('#tbl').hide();
+    $.getJSON('{pluginUrl}/Compare',function(d){{
+        data=d.Results;
+        $('#sTotal').text(d.TotalDevices);$('#sMatch').text(d.DevicesMatched);
+        $('#sMismatch').text(d.DevicesMismatched);$('#sNotAD').text(d.DevicesNotInAD);
+        $('#sNoMgr').text(d.DevicesNoManagedBy);$('#sNoAssign').text(d.DevicesNoAssignment);
+        $('#summary').show();$('#btnExport').prop('disabled',false);
+        renderTable();$('#tbl').show();
+    }}).fail(function(x){{alert('Error: '+x.statusText);}})
+    .always(function(){{$('#loading').hide();$('#btnRun').prop('disabled',false);}});
+}}
+function renderTable(){{
+    var mo=$('#chkMismatchOnly').is(':checked'),q=$('#txtFilter').val().toLowerCase(),tb=$('#tbody');tb.empty();
+    data.forEach(function(r){{
+        if(mo&&r.IsMatch)return;
+        if(q){{var hay=(r.SerialNumber+' '+r.ComputerName+' '+r.DiscoAssignedUserId+' '+r.ADManagedByUserId+' '+(r.DiscoAssignedUserDisplayName||'')+' '+(r.ADManagedByDisplayName||'')).toLowerCase();if(hay.indexOf(q)<0)return;}}
+        var icon=r.IsMatch?'<i class=""fa fa-check text-success""></i>':(!r.FoundInAD?'<i class=""fa fa-times text-danger""></i>':'<i class=""fa fa-exclamation-triangle text-warning""></i>');
+        var discoUser=r.DiscoAssignedUserId?(esc(r.DiscoAssignedUserId)+(r.DiscoAssignedUserDisplayName?'<br/><small class=""text-muted"">'+esc(r.DiscoAssignedUserDisplayName)+'</small>':'')):'<em class=""text-muted"">Not assigned</em>';
+        var adUser=r.ADManagedByUserId?(esc(r.ADManagedByUserId)+(r.ADManagedByDisplayName?'<br/><small class=""text-muted"">'+esc(r.ADManagedByDisplayName)+'</small>':'')):(r.FoundInAD?'<em class=""text-muted"">Empty</em>':'<em class=""text-muted"">N/A</em>');
+        tb.append('<tr class=""'+(r.IsMatch?'':'warning')+'"">'+'<td>'+icon+'</td><td>'+esc(r.SerialNumber)+'</td><td>'+esc(r.ComputerName||'')+'</td><td>'+discoUser+'</td><td>'+adUser+'</td><td>'+esc(r.MismatchReason||'')+'</td></tr>');
+    }});
+}}
+function esc(t){{if(!t)return'';var d=document.createElement('div');d.appendChild(document.createTextNode(t));return d.innerHTML;}}
 </script>";
         }
-
-        #endregion
     }
 }